Index: zorg/buildbot/builders/SanitizerBuilderWindows.py
===================================================================
--- zorg/buildbot/builders/SanitizerBuilderWindows.py
+++ zorg/buildbot/builders/SanitizerBuilderWindows.py
@@ -142,7 +142,7 @@
                           env=Property('slave_env')))
 
     # Get absolute path to clang-cl.
-    clang_cl = "%(workdir)s/" + build_dir + "/bin/clang-cl"
+    clang_cl = ("%(workdir)s/" + build_dir + "/bin/clang-cl").replace("\\", "/")
     f.addStep(ShellCommand(name='cmake',
                            command=[cmake, "-G", "Ninja", "../llvm",
                                "-DCMAKE_BUILD_TYPE="+config,